Conversion table (micrograms to milligrams)
| Micrograms | Milligrams | |
|---|---|---|
| 25 mcg | 0.025 mg | vitamin D 1000 IU |
| 50 mcg | 0.05 mg | |
| 100 mcg | 0.1 mg | |
| 250 mcg | 0.25 mg | |
| 400 mcg | 0.4 mg | folic acid |
| 500 mcg | 0.5 mg | |
| 1000 mcg | 1 mg | equals 1 mg |
| 2500 mcg | 2.5 mg | |
| 5000 mcg | 5 mg |
How to convert mcg to mg
- mcg
- micrograms you enter (also written µg)
- mg
- the result in milligrams
- 1000
- micrograms in every milligram
Both units are metric, so the conversion is exact: shift the decimal three places. 1250 mcg is 1.25 mg, and 0.3 mg is 300 mcg.
This tool is for reference only and is not medical advice. Always follow the dose on the label or from your doctor or pharmacist.
Frequently asked questions
How many mcg are in a mg?
One milligram contains 1000 micrograms.
Is mcg the same as µg?
Yes. mcg, µg and microgram are three ways of writing the same unit. "mcg" is preferred on labels to avoid misreading the µ symbol.
How many mg is 1000 mcg?
1000 mcg is exactly 1 mg.
Is 500 mcg the same as 0.5 mg?
Yes, 500 mcg equals 0.5 mg.
What is 5000 mcg in mg?
5000 mcg is 5 mg.
How do I convert mcg to IU?
That depends on the substance, since IU is defined separately for each. Use the mcg to IU page and pick your vitamin.
Related conversions
Reading a vitamin label? mcg to IU handles vitamins D, A and E, where the IU value depends on the exact form. For a liquid medicine, mg to cc and mcg to mL turn a dose into a volume once you know the concentration. And for a blood-test result, mmol/L to mg/dL covers glucose and cholesterol. None of these replace a clinician's instructions.